Improvement in flue-scrapers



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. IMPROVEMENT .IN FLUE-SGRAPBRS.

i KNOW ALL .MENEN THESE PRESENTS:

E. A. BLAKE AND H. A. or WORCESTER, MASSACHUSETTS. Y

l That we, F. A. BLAKE and H. A. TYEEEL, both ofthe city and county ofWorcester, and Commonwealth of Massachusetts, have made' certain newVand useful Improvements in Flue-Scrapersg and we do hereby declare lthat the following` is a full, clear, and exact description of the same,reference being had to the accompanying drawings, forming a part of thisspecification, in which- Figure l represents a perspective View of asection'of a flue with our scraper applied thereto, a portion of theflue being shown broken away, to show the scraper more fully; and

Figure .2 represents alongitudinal central section of springB and a partof the rod A to whichit is' attached. l In the drawings, A represents ametallic rod, upon which is placed'the coiled spring B, madein' thisinstance` 'in therforinrof a double cone, each` end, C, of spring Bbeing so coiled as to fit closely the rod A. small pin, a, is passedthrough rod A, just inside 4ol" each end of the coiled spring 13, andtwo other pins, In b, areinserted in rod A upon the outside ofspringB,.a`s fully shown inl the drawings. Spring B is coiled so thatwhen it is not in use the centric part is a little'larger than theilueto bc scraped.

The'operation is as followsi The operator takes hold of the end D of rodA', and inserts the other end with the coiled .springBinto the ine E.When the spring is inserted it is contracted: somewhat, so that when itis moved back and forth in the ilue it presses against the inner surfaceof the flue and conforms freely to the inequalities thereof, and thuseti'eetually removes allidirt, ashes, and scales from the inside of theiiues, and that, too, without injuring the metal of the flue, as isthecasein'ith many ofthe iiue-scrapers now' in use. By the use of pins aa and b b, spring E is allowed to elongate in either direction to acertain eKtent, butlnotso lnuch as to injure the spring. This isillustrated iny red lines, iig. 2, which shows the positionwhich springB assumes when being withdrawn from il-ue E, fig. l. It will be seenthat the first pin a holds' the front of spring B from Sliding back,while the rear pinstops the further elongation of the spring B. Whenthe' spring is being forced intothe Hue, the action of the spring Bisreversed, and the rear of thespring is held hy the rear pin a, and therst pini() arrests the further elongation ot'spring B.

Spring B might be usedv when confined to rod A in a different manner,although we regard the Inode above described as the best.

Instead of a metal rod to support the spring, one made-oil any othersuitable material may be employed, and `a. coiled spring made of anyshaped wire may also be used.v The spring, too, may be made in diiierentshape from that shown in the drawings.

secure by Letters Patent, isj p y l 1. The combination with rod A of thespi'ral spring, substantially as and for the purposes stated.

HavinfY described our im ro'ved flue-sera er whatwe claim as new and ot'our invention and desire to o r O a 2. The Combination of springBwithrod A and pins a ci and l 6, substantially as and for `the purposesset''orth.

E. A. BLAKE, H. A. TYREEL.

Witnesses:

Tues. DODGE, D. L. MILLER.

